Combined gas and coal range.



R. W. DAVENPORT. COMBINED GAS AND COAL RANGE.

APPLICATION FILED OCT. 10, 1914. &,235,015. Patented July 31, 1917.

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` APPLICATION FILED ocr. Io, 1914. I .A l ,235 O1 5 Patented July 31, 1917,

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COMBINED GAS AIVD COAL IR'AN'GLl insaore.

. Specification of Letters Patent.

Application led October 10, 1914. Serial No. 866,074.

To allrwhom t may concern:

Be it known lthat I, RANsoM W. DAVEN- PORT, a citizen of the United States of America, residing at' Detroit, in the county of l/Vayne and State of Michigan, have 1n- Avented certain new and useful Improvements in Combined Gas and Coal Ranges, of which the following is a specification, reference being had thereinto the accompanying drawm i for use with either solid or gaseous fuel and comprises various features of construction as hereinafter setforth.

In the drawings:

Figure l is a sectlonarluperspective view of A is the outer casing containing the fire# box, and oven C and a closed too D provided with the usual removable lids. Adjacent to the closed top and forming an extension thereof is an open top E, beneath which is a suitable housing F forvreceiving the gas' burners Cr. The oven C is Aheated by the gases of combustion in the fire-box B, which pass along the top iue H, down the end Hue I and through the bottom iiue J to the exit ue K in the rear. The oven may also be heated by gas, and to this end is provided with'a gas burner L arranged in the bottom portion thereof, above which is arranged a marginally perforated baffle plate M forming a false bottom. A

To adapt the range so that it will operate equally well with either solid or the gaseous fuel, I have introduced various novel features as follows,-For heating the top of the stoveit is essential that the space for the gas burners should be separate and distinct from the iiue for the gaseous products from the solid fuel, but it is equally desirable to have a lflush top for both coal-heated and gas-heated sections. I have therefore provided a sheet metal housing F which is arranged beneath the open top E and separates the same from the closed top D. The depth required for this housing F is greater than that required for the iue space between the Oven and the closed top, and it is undesirable The invention relates to ranges designed to increase the depth of the latter space for best results. On the other hand, in heating the oven by the gas burner L it is desirable to prevent the overheating directly above the burner by the .arrangement of the bafie M together with heat-insulation M therebei neath. This interposes resistance to the pasratenteu Jury si, reir'.

sage of the heat from thebottom flue J when the oven is operatedby the combustion of solid fuel, which would tend to cause a relative overheating of the top of the oven.

I have overcome the difficulty by interposing above the oven a thermal insulation which will balance that below the oven,y

thereby preventing the vabstraction of too great heat from the gases in the top flue H and thereby increasing their temperature in passing through the bottom ue'J. I have also overcome the objection to the increased depth of top flue due to the depth of the housing F for` the gas burner section by arranging a double flue at the top, theiupper portion being for the products of combustionfrom the solid fuel and the lower yportion constituting an exit for the gases from the burner L. Thus, as shown, N is a iue extending transversely across the top of the oven C and communicatingwith the space 'in said oven through apertures N in the top thereof. This Hue at its rear end communi; cates with the escape Hue K, and the height of the ue above the top of the oven is such .as to diminish the space betweenthe top of the flue and the stove top to'a desirable depth.

AWhere an oven is heated externally, as by the products ofcombustion from the solid fuel, any venting of theI oven chamber vwill result in diminished efficiency.` On the other hand, where the oven is internally heated, as by a gas burner, the Venting is essential to the proper circulation of the gases within the oven chamber and 'to the supplying of oxygen .to the burner for supporting combustion. I have therefore provided means for alternatively venting and cutting off| draft connection to the oven, and vto insure proper adjustment the vent is automatically controlled vby the gas burner, so that when the latter is not in use the vent'is closed but upon' turning on the gas it is automatically opened. For this purpose an air chamber O is arranged in the front of the oven and is connected by a link P with the operating handle Q of the gas control valve. Whenever this valve is opened the link will -comes from outside cause the simultaneous opening of the dampen-while up'on the closing of the valve the damper also willbe closed.

In operation when the stove is used with solid fuel the gaseous products of combustion will pass from the fire-box B over1 the flue N, down the flue I, through the bottom iiue J and to the escape Hue l. The interposition of the flue N between the hot prod ucts of combustion and the top of the oven will prevent the overheating of the latter7 and to absolutely guard against overheating thermal insulation R is also placed over the oven top. At the bottom the interposition of the chamber containing the gas burner below the false bottom M will form a balancing heat-insulation7 so that the top and bottom will be uniformly heated. The oven chamber is in communication with the exit flue N, but by reason of the fact that the chamber 0 is closed air is prevented from entering the oven chamber' to vdisplace the heated air. Thus in effect there is a closed oven chamber. When gas is used for fuel the turning on of the valve Q will open the chamber O, so that air is applied to the burner, and the hot gases are permitted to pass around the bathe M through the oven chamber and finally out through the flue N to the escape iiu'e K.

It will be observed that there is no con/:munication between the surrounding dues for the gaseous products from the solid fuel and the interior of the oven; it will also be ob served that the burner is in the oven and that the air supporting combustion the stove and not through the surrounding dues. This prevents any interference with the eiiiciency of the coal stove by reason of the gas b er7 or of the gas heater by reason of the adaptation for use of solid fuel'.

The gas heated top is also entirely independent of the coal heated top, but tof,y extent yof the former is such as to partially loverlap the oven.. Interference with the oven flues is prevented by dropping the oven so as to provide clearance beneath the housing or pan for the gas burners7 and, as has been described the flue beneaththe coal heated top is restricted in depth by the transverse flue N above the oven. Thus without increasing the height of the stove or changing the plan of the coal and gasheated tops I have obtained the necessary depth for the housing of the gas burners without interference with the oven or its surrounding iiues.

What I claim as my invention is:

1. In a cooking range, the combination with a casing having adjacent top sections respectively heated by solid and gaseous fuel, of a housing beneath the gas-heated section, an oven within said casing overlapped by said housing and arranged therebeneath to form a flue therebetween, a firebox adjacent to said oven7 and a casing,

above said oven adjacent to said fire-box deiecting the gases from the fire box into proximity with the stove top, said casing forming a transversely-extending escape iiue connected with said oven chamber.

2. In a cooking range, the combination with an oven,y of a casing containing a rebox and providing flues surrounding the oven, a false bottom in said oven a burner arranged beneath said false lbottoneL and between the same and the bottom portion of the surrounding'iiue, a casing above said oven forming a thermal insulation between the oven and the top portion of the surrounding flue, a housing adjacent the stove beneath to forni a iiue therebetween, a nre` box adjacent to said oven, a casing above said oven adjacent to the fire-box Jor diminishing the nue-space beneath the coal-heated top, said casing forming a thermal insulation above the oven and forming an escape fl e for the oven'gases, and a thermal insu,- the oven bottom substantially counancing that above the oven.

`fith casing having adjacent top sections :esoectivel heated b solid and gaseous cation, an oven within said casing over l by said housing and arranged theresheath to form a Hue therebetween, said fiue having a portion extending beneath the oven, a lire box with which said ue communicates, and a casing above said oven7 serving the triple functions of. an escape flue for the gases from the oven burner, a means for deiiecting the gases from the fire box into proximity to the stove top, and a thermal insulation substantially counterbalancing that formed between the oven bottom and false bottom. f

En testimony whereof I affix my signature in presence of two witnesses.

RANSOM W. DAVENPORT.

l/Vitnesses:

Jarras P. BARRY, HENRI E. Bowiyralv.V

n a cooking range, the combination r let? fuel, of a housing beneath the gas vheated s 

